#sidebar {
    display: flex;
    flex-flow: column;
    background-color: #f0f0f0
}

/* 侧边栏链接 */
#sidebar a {
    display: block;
    color: black;
    padding: 0.5em 1em;
    text-decoration: none;
    min-width: 8em;
}
  
/* 活动/当前链接 */
#sidebar a.active {
    background-color: #4CAF50;
    color: white;
}
  
/* 鼠标悬停链接 */
#sidebar a:hover:not(.active) {
    background-color: #555;
    color: white;
}

#wrapper {
    display: flex;
    flex: 1;
}

#container {
    flex-grow: 1;
    height: 100%;
}

@media screen and (max-width: 600px) {
    #wrapper {
        flex-flow: column-reverse;
    }
    #sidebar {
        flex-flow: row;
    }
}

video {
    width: 100%;
    max-height: 100%;
}
html {
    height: 100%;
}

body {
    height: 100%;
    margin: 0px;
    padding: 0px;
    display: flex;
    flex-direction: column;
}

#centerp {
    text-align:center;
    padding: 10px;
}